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Fencer Intel
high 7.8

CVE-2025-71155 json

KVM: s390: Fix gmap_helper_zap_one_page() again

published 9mo ago modified 3mo ago also EUVD-2026-4402

cvss
7.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.1%
EPSS 0.1% chance of exploitation in 30 days, percentile 2%
public exploits
0
none known

Summary

In the Linux kernel, the following vulnerability has been resolved:

KVM: s390: Fix gmap_helper_zap_one_page() again

A few checks were missing in gmap_helper_zap_one_page(), which can lead to memory corruption in the guest under specific circumstances.

Add the missing checks.

Patch / fix

  • Linux Linux 6.18, 6.18.4, 6.19
  • linux Debian 14 6.18.5-1

debian advisories DEBIAN-CVE-2025-71155

  • linux Ubuntu 25.10 6.17.0-29.29
  • linux-aws Ubuntu 25.10 6.17.0-1015.15
  • linux-gcp Ubuntu 25.10 6.17.0-1018.19
  • linux-azure Ubuntu 25.10 6.17.0-1015.15
  • linux-raspi Ubuntu 25.10 6.17.0-1017.17
  • linux-riscv Ubuntu 25.10 6.17.0-29.29.1
  • linux-oracle Ubuntu 25.10 6.17.0-1014.14
  • linux-aws-6.17 Ubuntu 24.04 LTS 6.17.0-1017.17~24.04.1

ubuntu advisories UBUNTU-CVE-2025-71155

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Is CVE-2025-71155 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2025-71155 updated cvss 7.8

kernel: Linux kernel KVM: Memory corruption in s390 gmap_helper_zap_one_page()

  • Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 more Red Hat Enterprise Linux 8 perf, kernel, bpftool, kernel-rt, kernel-core, kernel-tools, +29 more Red Hat Enterprise Linux 9 rv, perf, rtla, kernel, bpftool, libperf, +83 more Red Hat Enterprise Linux 10 kernel
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.13% chance of exploitation in the next 30 days, higher than 2% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

  • Linux Linux

Classification

Weakness
Technology feeds

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.